The modulation of upconversion in BaTiO₃:Yb³⁺, Er³⁺ inverse opal structures

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• 作者：Tianya Tan^a ; Yazhou Han^a ; Chunyu Zhang^a ; Yanan Ji^a ; Fan Zhang^a ; Qiang Chen^a ; Chun Wang^a ; Yong Mei^a ; Panfeng Xu^a ; Lina Li^a ; Yongsheng zhu^b ; * ; ^{yongshengzhu0001@163.com} ; Jiwei Wang^a ; ^{jiweiwang6688@yahoo.com}
• 关键词：Upconversion ; inverse opal structure ; photonic band gaps (PBG) ; cross-relaxation process ; energy back transfer (EBT)
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：183
• 期：Complete
• 页码：448-451
• 全文大小：644 K
• 卷排序：183

文摘

Under 980 nm excitation, it is observed that green upconversion emission is suppressed whereas red emission is enhanced when the photonic band gap (PBG) covers the spectral region of green emission in the BaTiO3: Yb3+, Er3+ inverse opal structure. The investigation of the PBG effect on upconversion dynamics reveals that the population of the low level 4I13/2 is increased by both cross relaxation and energy back transfer processes when spontaneous emission of higher levels is suppressed. Then, following energy transfer or excited state absorption processes starting from 4I13/2, the intensity of red emission is enhanced. The ratio of 525 nm versus 550 nm emission presents the temperature of samples when the PBG complete or absent covers the green emission band. However, the branching ratio deviates the temperature index in condition of a part of overlap between PBG and green emission band.